FL composed entirely of centroblasts (FL, grade 3B) was renamed follicular large B-cell lymphoma.(27) WHO-HAEM5 also included a subcategory of FL with unusual cytologic features, including cases with blastoid chromatin, and those composed of large centrocytes and a subcategory of FL with a predominantly diffuse growth pattern,(27) overlapping with the ICC category of BCL2-rearrangement negative, CD23 + follicle center lymphoma. The gene discussed is FCER2; the disease is follicular lymphoma.